Thermostatic alarm.



E. WINTERER.

THERMOSTATIC ALARM. APPLICATION FILED JUNE 21, I916.

Patented J une 12,- 1917.

WITNESSES ATTORNEY i The operative elements nun. wmrnnnn,

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Application filed June 21,

To all whom it may concern:

Be It known that I, EMIL WINTERER, a citizen of the United States, residing at Manchester, in the county of Hillsborough and State of New Hampshire, certain new and useful Improvements in Thermostatic Alarms, ing is a specification.

his invention relates to thermostatic alarms, and more particularly to a thermostatic alarm which can be adjusted to operate at any one of a number of different temperatures.

Onemof the main objects of the invention to provide an alarm of the character stated of simple construction and operation which can be quicklyand easily ad, justed to operate .at any desired temperature. A. further object is to provide such an alarm which can be constructed at very small cost. Further objects will appear from the following detailed description.

In the drawings Figure 1 is a front view of the invention,

Fig. 2 is a side view, with the side door in open position, and

Fig. 3 is a detail.

of my invention are mounted in a rectangular casing having the end walls 1 and 2 and the side walls 3 and 4, the latter of which is hinged to the wall 2 to. form a door permitting easy access to the interior of the casing.

The top and bottom of the casing are covered by wire gauze or screens 5 so as to. permit free circulation of air through the same.

Mounted in the lower inner end of the easingis a train of gear designated generally by 6 and operated by a coil spring in the same manner as clock gearing, this spring being wound by the usual thumb lever 7 and stem 8. The escape wheel 6 of the train 6 is normally locked against movement by the escapement control lever 9 pivoted at 1,0 to the side wall 3 of the casing. The outer end of this lever is of flattened shape, as at 11. A cylindrical socket 12 is fixedly supported above the flattened portion 11 of lever 9, near the outer end thereof, by means of a bracket 13 secured to wall 3 of the casing. This socket is adapted to receive the plug 14 of wax or other easily fusible material, this plug acting to hold the outer end of lever Specification of Letters Patent.

have invented of which the follow- Patented June 12,1917.

1916. Serial No. 104,993.

9 depressed and the inner end9 thereof engagement with the escape wheel 6.

' small reel 15 is rotatably mounted in angle brackets 16 secured to the wall 3 of the caslng. The shaft 17 of this reel is extended'through the front of the casing and carries an index needle 18 secured thereon. A disk 19 is secured on the front of the caslng concentric, to the shaft 17. The face of this disk is graduated for the purpose to be later disclosed.

fine chain 20 has one end secured to the reel 15 and its other end secured to the upper end of a coil spring 21 the lower end of which is secure 'to the escapement control lever 9 between the pivot 10 and the flattened portion 11. When the chain is wound upon the reel so as to tighten spring 21 the outer portion of lever 9 is pulled upward, the tension exerted upon the lever depending upon the extent to which the chain is wound upon the reel. Obviously, if the spring 21 is placed under tension so as to exert an upward pull on the outer part of the lever, it will not be necessary for the plug 14. to become completelyfused before the outer end of the lever will move upward, as, if the plug become sufficiently soft to permit upward movement of the outer end of the lever under the action of the spring 21, the inner end 9 of the lever will be moved downward so as to release the escapement wheel 6". From this it will be evident that, by winding more or less of the chain 20 upon the reel, the temperature at which the lever!) will be operated to release the escapement wheel 6 can be varied within comparatively wide limits. To secure these various adjustments, the -ratchet wheel 22 is secured 'on the shaft 17 of the reel adjacent the inner face of the front wall 1 of the casing, and a pawl 23 is pivoted to engage this ratchet wheel. By turning the index needle 18 to the left, the

' chain 20 will be wound upon the drum 15 and the tension of spring 21 increased, the reel being locked in the position to which it is rotated by the ratchet wheel 22 and pawl 23. By using a plug of predetermined composition, the space through which it is necessary to rotate the index needle to have the device operate at a desired temperature may be easily determined, and the disk 18 may be marked in accordance with these findings, as indicated in Fig. 1. In this figure, the needle is set at 70. This indicates or partly fused,

that the reel is in such "position that the spring 21 exerts suflicient upward pull on the outer part of lever 9 to cause it to move upward when-the temperature of the place in which the device is located is 7 0 degrees Fahrenheit. .By turning the needle to the division marked 75 on. the disk 19, v

the alarm would operate at a temperature of 75 degrees. By providing a disk with a series of graduationsthe device can be set to operate at practically any temperature desired, within very wide limits.

An escapement anchor 24: is pivotally mounted on the'side wall 3 of the casing and carries a striker 25. A bell 26-is mounted on wall 3,in such position as to be struck by the striker 25 when the same is vibrated. When the inner end 9" of lever 9 is moved out of engagement with escapement wheel 6*, the wheel is rotated in'the usual manner and acts to rock the anchor 24 back and forth on its pivot 24*, thus vibrating the striker 25 and ringing the bell 26 so as to give the alarm.

After an alarm has been given, the fused, plug it may be removed and replaced by a new plug by pressing the outer end of lever 9 downward sufliciently to permit the insertion of the plug into the socket 12. Of course, it will be evident that plu of different compositions may be used which will fuse at different temperatures. By this means, as well as by means of the reel 15, chain 20, and spring 21, the opera- -tive temperature of the alarm may varied be made in the arrangement and construction of the elements of myalarm, and I intend to include all such variations within this application, in which a preferred form only of my invention is disclosed.

-What' I claim is'.

1. In a thermostatic alarm, the combination of a bell, a striker pivotally mounted adjacent said bell, a gear train connected to the striker and adapted to cause vibration of the same, an escapement control lever pivoted at its center and normally engaging said gear train to lock the same against operation, a fixedly mounted plug socket above the outer end of said lever, a fusible plug mounted in. said socket and engaging the I casing,

said lever, a tension, spring secured to ,the lever between its pivot point and its outer end, a reel mounted above the lever, flexible means secured to the reel so as to be wound thereon, said means being also secured to the spring, and means'for securing the reel in rotary adjustment.

2. In a thermostatic alarm, the combination of a casing, a bell mounted within the of gearconnected' to said striker and adapted to vibrate the same, an escapement control lever pivotally mounted intermediate its ends within the casingand having one end normally in engagement with said gear train so as to lock the same against operation, a

- plug socket fixedly mounted within the casing'above the other end of the lever, a fusible plug mounted in the socket and confined between the same and the lever, a rotary adjustable reel, and connections between the reel and the lever for varying the upward pressure exerted by the lever on the fusible plug in accordance with the adjustment of the reel. 2

. 3. In a thermostatic alarm, the combination of a casing, a bell mounted within the casing, a striker pivotally mounted adjacent the bell, a gear train connected to the striker and adapted to cause vibration of the same, an -escapement control lever pivoted intermediate its endshaving one end normally engaging said gear train so as to lock the same against operation, a plug socket fixedly mounted above the other end of the lever, a fusible plug mounted in the socket and engaging the lever, a tension spring secured to the lever intermediate its pivotal axis and the end thereof in engagement with the plug, a reel mounted above the lever, a flexible element secured to the reel so as to be wound thereon and having its free end secured to the upper end of the spring, a ratchet wheel secured on the shaft of the reel, and a pawl mounted on one end of the casing and in engagement with the ratchet wheel for securing the reel in rotary adjustment.

In testimony whereof I affix my signature in presence of two witnesses.

WILLIAM DRUCK-E.

a striker adjacent the bell, a train- 

